Portable medical electric oral cavity liquid suction device

Abstract

The invention provides a portable medical electric oral cavity liquid suction device which comprises a shell, a liquid suction pipe connecting port formed in the shell, a power module arranged in the shell and a self-suction diaphragm pump arranged in the shell and electrically connected with the power module, and a liquid suction port and a liquid discharge port are formed in the self-suction diaphragm pump. The liquid suction pipe connecting port is communicated with the liquid suction port through a pipeline; the liquid suction device is further provided with a liquid storage bin, the liquid storage bin is connected with the shell through a liquid storage bin connector, the liquid storage bin connector is provided with a liquid inflow port and an exhaust hole, and the liquid inflow port is connected with a liquid inflow pipe extending into the liquid storage bin. And the liquid inlet is communicated with the liquid outlet through a pipeline. An air pressure sensor is arranged at a liquid suction opening of the self-suction diaphragm pump, and the self-suction diaphragm pump can be controlled to work through a controller according to environment variables. The portable medical electric oral cavity liquid suction device is small in size, light in weight and convenient to use and has good application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of oral hygiene, and in particular to a portable medical electric oral liquid aspirator. Background Art

[0002] Patients who are bedridden for a long time, have difficulty in moving, are paralyzed on one side, and cannot take care of themselves cannot discharge the liquid and food residue in their mouths after sputum, brushing teeth, gargling, and eating. An "oral suction device" is needed to assist in sucking out the liquid and food residue in the patient's mouth. If it is not cleared and discharged in time, once it enters the lungs by mistake, it will cause lung infection and other problems.

[0003] The aspirators used on-site in hospitals or dental clinics are often large and bulky, and are suitable for use in fixed places. However, once the patient goes out or is transferred, such aspirators are often not portable. In general, the existing oral aspirators have the following problems: 1. The product structure is complex and the production cost is high; 2. The product is heavy and inconvenient to use; 3. The product is large in size and not easy to place and carry. Therefore, it is necessary to develop a portable oral aspirator suitable for home use. Summary of the invention

[0004] The purpose of the present invention is to provide a portable medical electric oral aspirator to solve the problems in the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A portable medical electric oral aspirator comprises a shell formed with a gripping handle structure, a pipette connecting port arranged on the shell, a power module arranged in the shell, and a self-priming diaphragm pump arranged in the shell and electrically connected to the power module, wherein the self-priming diaphragm pump is provided with a suction port and a discharge port, and the pipette connecting port is connected to the suction port through a pipeline; the aspirator also has a liquid storage tank, which is connected to the shell through a liquid storage tank interface, and the liquid storage tank interface has a liquid inlet and an exhaust hole, and the liquid inlet is connected to a liquid inlet tube extending into the liquid storage tank; the liquid inlet is connected to the discharge port through a pipeline.

[0007] Furthermore, a pressure sensor is provided at the liquid suction port of the self-priming diaphragm pump, and the pressure sensor is connected to a controller. The controller controls the power of the self-priming diaphragm pump. When the air pressure detected by the pressure sensor is lower than a set threshold, the controller controls the self-priming diaphragm pump to increase the power to a predetermined maximum power, or the controller controls the self-priming diaphragm pump to increase the power until the air pressure reaches a predetermined minimum pressure.

[0008] Further, when the air pressure drops to a stable state and does not drop any more and is maintained for a predetermined time or when the air pressure drops and then rises to a stable state and is maintained for a predetermined time, the controller controls the self-priming diaphragm pump to reduce power to a predetermined power and maintain it for a predetermined time.

[0009] Furthermore, a filter cavity communicated with the outside of the shell is formed in the shell, a water-absorbing sponge is arranged in the filter cavity, an exhaust pipe is connected to the exhaust hole, and the exhaust pipe extends into the filter cavity.

[0010] Preferably, a cover plate which can be opened and closed is provided at the connection point between the filter cavity and the outside of the housing.

[0011] Preferably, the liquid storage bin is a liquid storage bottle, and a snap-fit ​​rotating shaft with two ends rotatably connected to the outer shell is further provided in the outer shell, the snap-fit ​​rotating shaft is a barrel-shaped structure, and a mounting port threadedly connected to the liquid storage bottle mouth is formed on the barrel-shaped structure, the liquid inlet tube passes through the snap-fit ​​rotating shaft and extends into the liquid storage bottle, and the exhaust hole passes through the snap-fit ​​rotating shaft through a pipeline and extends into the liquid storage bottle.

[0012] Preferably, the rotation angle of the clamping shaft relative to the housing can be 30 to 90 degrees.

[0013] Preferably, the housing is provided with a fixing clip that can clamp and fix the liquid storage bottle. The fixing clip and the above-mentioned clamping shaft can facilitate the disassembly of the liquid storage bottle. In addition, the connection port of the present invention adopts a threaded manner, which can be set to a thread of the same specification as a common beverage bottle, so that the liquid storage bottle can be replaced with an everyday beverage bottle.

[0014] Further, the pipette connection port is connected with a pipette, the pipette head of the pipette is wrapped with a flexible filter net, and the end of the pipette has a thin silicone cross flow limiting piece. The cross flow limiting piece can prevent the backflow of sputum. The thin silicone cross flow limiting piece here can also be other flow-stop valves with backflow prevention.

[0015] Preferably, a storage cavity capable of storing the pipette is provided inside the shell near the connecting port of the pipette, and a storage cover for opening and closing the storage cavity is provided on the shell.

[0016] Preferably, a power module is installed inside the gripping handle structure of the housing, and the power module is electrically connected to the self-priming diaphragm pump.

[0017] Furthermore, the housing is provided with a main switch, a stepless potentiometer adjustment switch connected in series with the main switch, and a self-reset switch for controlling the operation of the self-priming diaphragm pump.

[0018] The portable medical electric oral aspirator of the present invention adopts a self-priming diaphragm pump as the main working part, which can be well miniaturized and can provide a maximum negative pressure of 0.05Mpa to meet the requirements of oral aspiration. The present invention uses an air pressure sensor and a controller, a built-in control program, and automatically controls the working power of the self-priming diaphragm pump by changing the pressure at the aspiration end. When starting to work, the self-priming diaphragm pump is at a relatively low power. When the aspiration head touches the sputum, the air pressure of the aspiration tube begins to drop. When the air pressure drops to a preset threshold, the controller controls the self-priming diaphragm pump to increase the power of the self-priming diaphragm pump, thereby achieving the effect of rapid sputum aspiration. When the sputum is sucked away, the air pressure will rise again. When it touches the inner wall of the oral cavity, the air pressure will rise to a certain value and remain stable. At this time, the controller controls the self-priming diaphragm pump to reduce the power and release the suction force on the inner wall of the oral cavity. In addition, in the case where there is no sputum, the air pressure at the end of the pipette drops to a certain value and remains stable after the pipette head touches the inner wall of the oral cavity. At this time, the controller controls the self-priming diaphragm pump to reduce the power and release the suction on the inner wall of the oral cavity.

[0019] The portable medical electric oral aspirator provided by the present invention has the advantages of reasonable structure, high reliability, stable performance, small size, light weight, low power consumption, easy to carry, simple operation, and automatic aspiration. It can be used to help patients who are bedridden for a long time and have difficulty in moving to keep their oral cavity clean at any time, avoid oral infection or lung infection caused by oral infection. At the same time, this product is simple to operate and easy to use, and can be used without any special skills and training. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the front structure of the oral aspirator provided in an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the side structure of the oral aspirator provided in an embodiment of the present invention;

[0022] Figure 3 A schematic cross-sectional view of the oral aspirator provided in an embodiment of the present invention;

[0023] Figure 4 A schematic structural diagram of a liquid pipetting head provided in an embodiment of the present invention.

[0024] Among them, 1. Shell, 2. Holding handle, 3. Pipetting tube connection port, 4. Power module, 5. Self-priming diaphragm pump, 6. Main switch, 7. Pipetting port, 8. Discharging port, 9. Liquid storage tank, 10. Liquid storage bottle, 11. Liquid inlet, 12. Exhaust hole, 13. Liquid inlet pipe, 14. Exhaust pipe, 15. Filter chamber, 16. Water-absorbing sponge, 17. Cover plate, 18. Snap-on shaft, 19. Installation port, 20. Fixing card, 21. Storage chamber, 22. Flexible filter net, 23. Pipetting tube, 24. Thin silicone cross current limiting plate, 25. Stepless potentiometer adjustment switch, 26. Self-reset switch. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings.

[0026] like Figure 1 , Figure 2 As shown, a portable medical electric oral aspirator comprises a shell 1 formed with a gripping handle 2 structure, a connection port 3 of a pipette 23 arranged on the shell 1, a power module 4 arranged in the shell 1, a self-priming diaphragm pump 5 arranged in the shell 1 and electrically connected to the power module 4, a main switch 6 for controlling the self-priming diaphragm pump 5 to be turned on and off and arranged on the shell 1, a suction port 7 and a discharge port 8 are provided on the self-priming diaphragm pump 5, and the connection port 3 of the pipette 23 is connected to the suction port 7 through a pipeline; the shell 1 is also provided with a liquid storage tank 9 connected to the shell, the liquid storage tank 9 is connected to the shell 1 through a liquid storage tank interface, a liquid inlet 11 and an exhaust hole 12 are provided at the liquid storage tank interface, the liquid inlet 11 is connected to a liquid inlet tube 13 extending into the liquid storage tank 9; the liquid inlet 11 is connected to the discharge port 8 through a pipeline.

[0027] The liquid storage tank 9 is connected to the housing in a detachable manner, which facilitates the disassembly and installation of the liquid storage tank 9 .

[0028] The inner area of ​​the housing 1 is hollow and is used to arrange the positions of various devices. The self-priming diaphragm pump 5 is the main core of the device. The self-priming diaphragm pump 5 is used to generate a negative pressure less than 0.05Mpa. When the main switch 6 is turned on, the suction port 7 is connected to the suction tube 23 connection port 3 through a pipeline, and connected to the external pipeline. Through the negative pressure, the external pipeline sucks the sputum from the patient's mouth into the self-priming diaphragm pump 5, and transfers the sputum from the pipeline to the liquid inlet 11 through the discharge port 8, and injects it into the liquid storage tank 9. The sputum injected into the liquid storage tank 9 will occupy the space in the liquid storage bottle 10, so the air is discharged through the exhaust hole 12 on the liquid storage bottle 10 to complete the overall sputum suction process.

[0029] In one embodiment of the present invention, an exhaust pipe 14 is connected to the exhaust hole 12 , and the exhaust pipe 14 is communicated with the outside of the housing 1 .

[0030] The function of the exhaust hole 12 is to exhaust the air in the liquid storage tank 9, and the exhaust hole 12 needs to output the exhausted air to the outside of the shell 1. Therefore, after the exhaust pipe 14 is connected to the exhaust hole 12, the other end can exchange gas with the outside of the shell 1 to transport the air exhausted from the liquid storage tank 9 to the outside of the shell 1, so that the liquid stored in the liquid storage bottle 10 will not be blocked by the internal air pressure and cannot be inhaled.

[0031] In one embodiment of the present invention, a filter chamber 15 communicating with the outside of the shell 1 is formed in the shell 1 , a water-absorbing sponge 16 is arranged in the filter chamber 15 , and an exhaust pipe 14 extends into the filter chamber 15 .

[0032] A filter chamber 15 is provided inside the housing 1, and a water-absorbing sponge 16 is provided inside the filter chamber 15, which mainly plays the role of filtering the gas in the liquid storage tank 9 discharged from the exhaust pipe 14. Since the sputum inhaled by the patient is stored in the liquid storage tank 9, when the excess air is discharged from the exhaust pipe 14, water vapor or even sporadic sputum may be brought out. In order to avoid sputum splashing and to prevent the equipment from being contaminated by sputum, a water-absorbing sponge 16 is used to block the outside of the exhaust pipe 14, which can effectively block the water vapor and sporadic sputum in the air discharged from the exhaust pipe 14, protect the equipment, and avoid secondary pollution caused by sputum splashing.

[0033] In addition, a silicone cross-shaped flow-limiting piece can be provided at the exhaust hole 12 to block the exhaust hole 12. The silicone cross-shaped flow-limiting piece is open in the middle and will open under a certain pressure. When the pressure is insufficient, it will remain closed. Such a setting can prevent the liquid inside the liquid storage tank 9 from flowing out under any circumstances. Even if the liquid storage tank 9 is inverted, the internal liquid will be blocked by the silicone cross-shaped flow-limiting piece, further avoiding pollution caused by the outflow of liquid.

[0034] In one embodiment of the present invention, a cover plate 17 that can be opened and closed is provided at the connection point between the filter cavity 15 and the outside of the housing 1 .

[0035] A cover plate 17 is provided outside the filter chamber 15 , and the cover plate 17 can be kept closed during normal use. After the absorbent sponge 16 has been used for a period of time, the cover plate 17 can be opened to replace the absorbent sponge 16 , thereby maintaining the overall cleanliness of the device.

[0036] In one embodiment of the present invention, the liquid storage bin 9 is a liquid storage bottle 10, and a snap-fit ​​shaft 18 is provided in the outer shell 1 at both ends of which are rotatably connected to the outer shell 1. The snap-fit ​​shaft 18 is a barrel-shaped structure, and a mounting port 19 is formed on the barrel-shaped structure and is threadedly connected to the mouth of the liquid storage bottle 10. The liquid inlet pipe 13 passes through the snap-fit ​​shaft 18 and extends into the liquid storage bottle 10, and the exhaust hole 12 passes through the snap-fit ​​shaft 18 through a pipeline and extends into the liquid storage bottle 10.

[0037] A clamping shaft 18 is provided inside the housing 1, and is threadedly connected to the liquid storage bottle 10 through the clamping shaft 18. The main function of the clamping shaft 18 is to enable the liquid storage bottle 10 to rotate, thereby facilitating the replacement of the liquid storage bottle 10. The rotation angle of the clamping shaft 18 relative to the housing 1 can be 90 degrees. When disassembling or installing the liquid storage bottle 10, the clamping shaft 18 is rotated so that the installation port 19 faces away from the outer side of the housing 1, which facilitates the disassembly and installation of the liquid storage bottle 10.

[0038] like Figure 3 As shown, in one embodiment of the present invention, a fixing card 20 capable of clamping and fixing the liquid storage bottle 10 is provided on the housing 1.

[0039] After the liquid storage bottle 10 is installed on the installation opening 19, the liquid storage bottle 10 is moved towards the shell 1 by rotating the clamping shaft 18. The fixing card 20 on the shell 1 is responsible for clamping the liquid storage bottle 10 through the elastic force generated by its own deformation, so that it is kept in a stable fixed position, which is also convenient for storing or releasing the liquid storage bottle 10, ensuring that the liquid storage bottle 10 remains in position during use to prevent the internal liquid from shaking and flowing out.

[0040] In one embodiment of the present invention, a receiving chamber 21 capable of receiving the pipette 23 is provided inside the housing 1 near the connecting port 3 of the pipette 23 , and a receiving cover for opening and closing the receiving chamber 21 is provided on the housing 1 .

[0041] A separate space area is set inside the shell 1 as a storage cavity 21 for storing the pipette 23, so that the pipette 23 can be stored inside the shell 1. In addition to being easy to carry, it also ensures that the pipette 23 does not contact the outside to avoid adhesion of bacteria or viruses, thereby ensuring the cleanliness and hygiene of the equipment when used by patients.

[0042] In one embodiment of the present invention, a power module 4 is installed inside the grip handle 2 of the housing 1 , and the power module 4 is electrically connected to a self-priming diaphragm pump 5 .

[0043] The power module 4 is arranged inside the grip 2, so that the space inside the housing 1 can be fully utilized, and the power module 4 can be carried together with the device, eliminating the inconvenience of using an external power source, making the device more convenient to carry and applicable to different special environments. A charging interface electrically connected to the power module 4 is arranged on the housing 1, so that the power module 4 can be charged and supplied with energy.

[0044] In one embodiment of the present invention, a stepless potentiometer regulating switch 25 connected in series with the main switch 6 is provided on the housing 1 .

[0045] The function of setting the stepless potentiometer adjustment switch 25 is to control the power of the self-priming diaphragm pump 5 and to start different power modes according to the needs of different situations.

[0046] In addition, a self-reset switch 26 may be provided on the housing 1 . The self-reset switch 26 is electrically connected to the power module 4 and the self-priming diaphragm pump 5 , so as to restart the device.

[0047] like Figure 4 As shown, in one embodiment of the present invention, a flexible structured liquid suction head can be provided at the end of a liquid suction tube 23 for sucking sputum from a patient's mouth, and the liquid suction head includes a flexible filter net 22 wrapped on the outside, a liquid suction tube 23 wrapped inside, and a thin silicone cross-current limiting piece 24 provided at the end of the liquid suction tube 23. The thin silicone cross-current limiting piece 24 here plays a role in that the liquid sucked into the liquid suction tube 23 can only enter the liquid storage bottle 10 under the action of negative pressure, and cannot flow back into the patient's mouth, thereby preventing the liquid from flowing out in the opposite direction.

[0048] In one embodiment of the present invention, a pressure sensor is provided at the liquid suction port 7 of the self-priming diaphragm pump, and the pressure sensor is connected to a controller, and the controller controls the power of the self-priming diaphragm pump 5. When the pressure detected by the pressure sensor is lower than the set threshold, the controller controls the self-priming diaphragm pump 5 to increase the power to a predetermined maximum power, or the controller controls the self-priming diaphragm pump 5 to increase the power until the pressure reaches a predetermined minimum pressure. When the pressure drops to a stable state and no longer drops and remains for a predetermined time, or when the pressure drops and then rises to a stable state and remains for a predetermined time, the controller controls the self-priming diaphragm pump 5 to reduce the power to a predetermined power and remains for a predetermined time. By means of the air pressure sensor and controller, the built-in control program automatically controls the working power of the self-priming diaphragm pump by the change of the pressure at the suction end. When starting to work, the self-priming diaphragm pump is at a relatively small power. When the suction head touches the sputum, the air pressure of the suction pipe begins to drop. When the air pressure drops to a preset threshold, the controller controls the self-priming diaphragm pump 5 to increase the power of the self-priming diaphragm pump 5, thereby realizing the effect of rapid sputum suction. When the sputum is removed by suction, the air pressure will rise again. When the pressure drops to a certain value when touching the inner wall of the oral cavity, it will remain stable. At this time, the controller controls the self-priming diaphragm pump 5 to reduce the power and release the suction force on the inner wall of the oral cavity. In addition, for the situation where there is no sputum, the air pressure at the suction pipe end after the suction head touches the inner wall of the oral cavity will also remain stable (but will not rise). At this time, the controller controls the self-priming diaphragm pump to reduce the power, release the suction force on the inner wall of the oral cavity, and maintains, for example, 1-5S, and then judges the subsequent execution operation according to the situation of the air pressure.

[0049] Working process of portable medical electric oral aspirator, method 1:

[0050] Turn on the main switch 6, the power module 4 starts, and the self-priming diaphragm pump 5 is powered. The self-priming diaphragm pump 5 generates negative pressure, and the end of the liquid suction port 7 generates negative pressure. Through the liquid suction tube 23, the negative pressure is transmitted to the liquid suction head. The liquid suction head is placed in the patient's mouth, touching the sputum, and the flexible filter net 22 contacts the inner wall of the oral cavity. The sputum is sucked into the liquid suction tube 23 through the thin silicone cross current limiting plate 24, and enters the self-priming diaphragm pump 5 through the liquid suction port 7, and the sputum is transported from the liquid discharge port 8 and the pipeline to the liquid inlet 11, and enters the liquid storage bottle 10 through the liquid inflow tube 13. The liquid storage bottle 10 discharges the excess air in the bottle through the exhaust hole 12, enters the filter chamber 15, and the air is filtered by the water-absorbing sponge 16, and then the air is discharged to the outside of the housing 1. During operation, the power of the self-priming diaphragm pump 5 can be adjusted according to demand through the stepless potentiometer adjustment switch 25 to achieve different negative pressure requirements.

[0051] After the liquid aspiration is completed, turn off the main switch 6, turn the bottom of the liquid storage bottle 10 outward, and the liquid storage bottle 10 will be freed from the restraint of the fixing card 20. The locking shaft 18 cooperates with the liquid storage bottle 10 to turn outward. After turning out of the shell 1, remove the liquid storage bottle 10, replace it with a clean liquid storage bottle 10, and push the liquid storage bottle 10 back to its original position, and re-lock it with the fixing card 20 to complete the overall workflow.

[0052] Working process of portable medical electric oral aspirator, mode 2: The overall process is the same as mode 1, but after turning on the main switch 6, automatic aspiration is achieved through the control program. Specifically, when the main switch 6 is turned on and the work starts, the self-priming diaphragm pump 5 is at a preset smaller power. When the aspiration head touches the sputum, the pressure of the aspiration tube begins to drop. When the air pressure drops to a predetermined threshold, the controller increases the power of the self-priming diaphragm pump 5, thereby achieving the effect of rapid sputum aspiration. When the sputum is sucked away, the air pressure will rise again, and the aspiration head will touch the inner wall of the oral cavity. After the air pressure rises to a certain value, it will remain stable (even if it does not touch the inner wall of the oral cavity, the air pressure will remain stable after rising to a balance value). When the pressure is stable for a predetermined time (for example, 1S or 2S, used to determine whether it is stable), the controller controls the self-priming diaphragm pump 5 to reduce the power, for example, to a preset power, to release the suction force on the inner wall of the oral cavity. In addition, in the case where there is no sputum, the pressure at the end of the pipette drops to a certain value and remains stable after the pipette head touches the inner wall of the oral cavity. At this time, the controller controls the self-priming diaphragm pump 5 to reduce the power to release the suction force on the inner wall of the oral cavity.

[0053] The portable medical electric oral aspirator of the present invention belongs to the "mysterious" small portable aspirator. The "EDVP08 micro self-priming diaphragm pump 5" is selected as the main machine. In terms of conventional aspiration function, it is superior to other similar products that use "oil-free lubricated piston pumps" and other piston pumps as the main machine. The advantage of the "EDVP08 micro self-priming diaphragm pump 5" is that it has low requirements on environmental conditions and can independently complete the aspiration and discharge functions without supporting equipment.

[0054] The portable medical electric oral aspirator provided by the present invention has the advantages of reasonable structure, high reliability, stable performance, small size, light weight, low power consumption, easy to carry, and a maximum negative pressure value of 0.05Mpa. It can help patients who are bedridden for a long time and have difficulty in moving to keep their oral cavity clean at any time, avoid oral infection or lung infection caused by oral infection and other problems. At the same time, this product is simple to operate and easy to use, and can be used without any special skills and training.

[0055] Although the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions and conversions can be made without exceeding the spirit and scope of the present invention defined by the appended claims. Moreover, the scope of the present application is not limited to the specific embodiments of the process, equipment, means, method and steps described in the specification. It will be easily understood by those of ordinary skill in the art from the disclosure of the present invention that the process, equipment, means, method or step to be developed in the present and future can be used to perform the functions substantially the same as the corresponding embodiments described herein or to obtain the results substantially the same as the corresponding embodiments described herein. Therefore, the appended claims are intended to include such processes, equipment, means, methods or steps within their scope.

Claims

1. A portable medical electric oral aspirator, characterized in that: It includes a shell formed with a gripping handle structure, a pipette connection port arranged on the shell, a power module arranged in the shell, and a self-priming diaphragm pump arranged in the shell and electrically connected to the power module, wherein the self-priming diaphragm pump is provided with a suction port and a discharge port, and the pipette connection port is connected to the suction port through a pipeline; the pipette also has a liquid storage tank, which is connected to the shell through a liquid storage tank interface, and the liquid storage tank interface has a liquid inlet and an exhaust hole, and the liquid inlet is connected to a liquid inlet pipe extending into the liquid storage tank; the liquid inlet is connected to the discharge port through a pipeline.

2. The portable medical electric oral aspirator according to claim 1, characterized in that: A pressure sensor is provided at the liquid suction port of the self-priming diaphragm pump, and the pressure sensor is connected to a controller. The controller controls the power of the self-priming diaphragm pump. When the air pressure detected by the pressure sensor is lower than a set threshold, the controller controls the self-priming diaphragm pump to increase the power to a predetermined maximum power, or the controller controls the self-priming diaphragm pump to increase the power until the air pressure reaches a predetermined minimum pressure.

3. The portable medical electric oral aspirator according to claim 2, characterized in that: When the air pressure drops to a stable state and no longer drops and is maintained for a predetermined time, or when the air pressure drops and then rises back to a stable state and is maintained for a predetermined time, the controller controls the self-priming diaphragm pump to reduce power to a predetermined power and maintain it for a predetermined time.

4. The portable medical electric oral aspirator according to claim 1, characterized in that: A filter cavity communicated with the outside of the shell is formed in the shell, a water-absorbing sponge is arranged in the filter cavity, an exhaust pipe is connected to the exhaust hole, and the exhaust pipe extends into the filter cavity.

5. The portable medical electric oral aspirator according to claim 3, characterized in that: The liquid storage bin is a liquid storage bottle, and the liquid storage bin interface is also provided with a clamping shaft at both ends rotatably connected to the outer shell, the clamping shaft is a barrel-shaped structure, and a mounting port threadedly connected to the liquid storage bottle mouth is formed on the barrel-shaped structure, the liquid inlet pipe passes through the clamping shaft and extends into the liquid storage bottle, and the exhaust hole passes through the clamping shaft through a pipeline and extends into the liquid storage bottle.

6. The portable medical electric oral aspirator according to claim 5, characterized in that: The shell is provided with a fixing card which can clamp and fix the liquid storage bottle.

7. The portable medical electric oral aspirator according to claim 1, characterized in that: The pipette connection port is connected with a pipette, the pipette head of the pipette is wrapped with a flexible filter net, and the end of the pipette is provided with a thin silica gel cross current limiting sheet.

8. The portable medical electric oral aspirator according to claim 7, characterized in that: The inner part of the shell near the connecting port of the pipette is provided with a storage cavity capable of storing the pipette, and the shell is provided with a storage cover for opening and closing the storage cavity.

9. The portable medical electric oral aspirator according to claim 5, characterized in that: The exhaust pipe has a flexible connection section or is connected to the filter chamber by clamping the axis of the rotating shaft, and the connecting pipe between the liquid inlet and the drain port has a flexible connection section or is connected by clamping the axis of the rotating shaft.

10. The portable medical electric oral aspirator according to claim 1, characterized in that: The housing is provided with a main switch, a stepless potentiometer regulating switch connected in series with the main switch, and a self-resetting switch, which are used to control the operation of the self-priming diaphragm pump.

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